Quote:
Originally Posted by visi107
Several people have already mentioned on this thread that they plan to use the 513M wheels for a winter setup.
What's the major difference between the 513M and the 640M(18'') which BMW advertises as winter wheels. I know the width is different 9 and 10 for the 513 and 8.5 and 9 for the 640, but anything else apart from that?
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Well for one the 640M are cast while the 513M are forged. The 640M are therefore heavier and less strong. The spokes on the 640M are quite thicker and have less space between the "twin spokes". And in terms of colour, the 640M are silver while the 513M are ferric grey, which is a darker shade of grey. Finally they have slightly different offsets (29/40 vs 27/29 F/R for the 513M vs 640M respectively).